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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

2016 Infiniti Q50 Eau Rouge Prototype [w/video]

It only takes about half a lap of the Millbrook Proving Grounds for me to become convinced that Infiniti must build this car.
The sedan I am piloting around the English circuit is a working prototype of the Q50 Eau Rouge Concept that made its world debut at the 2014 Detroit Auto Show earlier this year. As a refresher, the exquisitely painted, burgundy metallic, four-door show car is based on the production Q50, enhanced with Infiniti Red Bull Racing-inspired carbon-fiber bodywork, aerodynamic upgrades and - as we would come to learn at the Geneva Motor Show a few months later - fitted with a beastly twin-turbocharged engine shared with the parent company's spectacular Nissan GT-R.
Despite lacking the concept's gorgeously expensive paint, the vinyl-wrapped red prototype seen here is much more appealing than the static concept, as it is mechanically complete - it can be driven - thus explaining why I have traveled one-third of the way around the world to test this enthusiast-tuned, one-of-a-kind machine at one of Europe's premier testing facilities.

2024 New York International Auto Show not-so-mega photo gallery

The 2024 New York Auto Show press preview is in the bag and the public show has begun, and that means only one thing: Our work here is done. But really, we've been done since about mid-morning on Wednesday. As you'll see from the paltry selection of galleries below, the 2024 New York Auto Show wasn't much of one. And what there was? Well, in a word, it was Hyundai.  As you scroll through the galleries below, you'll note that we have items from essentially two global conglomerates. In one corner, there's Hyundai, Genesis and Kia. In the other, we have Nissan and Infiniti. But that's being a bit generous to Nissan and its luxury subsidiary, because while this is the first chance we really had to see the Nissan Kicks and Infiniti QX80 in person (and that's not even entirely true of the latter), they weren't actually revealed at the show.  New York has never been America's biggest "international" auto show, but it has been the venue for some big unveilings. In 2012, the new SRT Viper debuted to great fanfare at NYIAS; the Lincoln Aviator made a big splash in 2018; how about the Alfa Romeo 4C in 2014? And those are just cherry-picking from the past decade. By comparison, the 2024 show feels a bit uninspired. Yes, we would have liked to have seen some Vipers. Sue us.  But we'll stop dwelling on what we can't resurrect. There's plenty to see at the show this year if you're planning to go in person, so don't let our negativity deter you. For those who can't be there, here's what you're missing: Genesis G80 Magma View 9 Photos 2025 Genesis G80 Magma Genesis GV60 Magma Concept View 10 Photos 2025 Genesis GV60 Magma 2025 Hyundai Tucson XRT View 14 Photos 2025 Hyundai Tucson 2025 Hyundai Santa Cruz XRT View 11 Photos 2025 Hyundai Santa Cruz InfinitiQX80-Z63-051 View 39 Photos 2025 Infiniti QX80 2025 Kia K4 Live View 7 Photos 2025 Kia K4 Sedan 2025 Nissan Kicks View 10 Photos 2025 Nissan Kicks     New York Auto Show Genesis Hyundai Infiniti Kia Nissan